ECS-40-S-1 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-40-S-1 is a 4 MHz through-hole crystal oscillator in HC-49/U package configuration, designed for fundamental mode operation across industrial temperature ranges. This part carries a "Not For New Designs" status, indicating it has been superseded in the manufacturer's product line. Identifying equivalent substitute parts is necessary for ongoing maintenance, repair, and legacy system support where direct replacement compatibility is required.

Substiute Parts

ECS-40-S-1

ECS Inc.In Stock: 1453ECS-40-S-1 Datasheet

Current PartRFQ

ECS-40-S-1X

ECS Inc.In Stock: 1185ECS-40-S-1X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-40-S-1 is determined by strict parameter matching across the following critical specifications:

• Frequency: Must be exactly 4 MHz
• Frequency Tolerance: Must be ±30ppm or tighter
• Frequency Stability: Must be ±50ppm or better
• ESR: Must be 100 Ohms
• Operating Mode: Must be Fundamental
• Package / Case: Must be HC-49/U
• Mounting Type: Must be Through Hole
• Operating Temperature Range: Must cover -10°C ~ 70°C minimum
• Load Capacitance: Must be Series configuration
• Physical Dimensions: Must match 0.447" L x 0.183" W and 0.530" max height

The ECS-40-S-1X meets all these parameters and qualifies as a direct parametric equivalent. The primary distinction is product lifecycle status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The ECS-40-S-1X is the direct substitute for the ECS-40-S-1. All electrical and mechanical parameters are identical, ensuring pin-for-pin and functional compatibility in existing circuit designs.

The primary differentiators are:

• Product Status: The ECS-40-S-1X carries Active status, indicating ongoing manufacturer support and availability, whereas the ECS-40-S-1 is designated Not For New Designs.
• RoHS Compliance: The ECS-40-S-1X is ROHS3 compliant, meeting current environmental and regulatory requirements. The ECS-40-S-1 is RoHS non-compliant.

For applications requiring regulatory compliance with modern environmental standards, the ECS-40-S-1X is the appropriate selection. For legacy system maintenance where the original part specification must be preserved, the ECS-40-S-1 remains functionally equivalent if available inventory permits.

Frequently Asked Questions (FAQ)

Q: Can the ECS-40-S-1X be used as a direct replacement for the ECS-40-S-1?

A: Yes. All electrical parameters (frequency, tolerance, stability, ESR, operating mode) and mechanical specifications (package, dimensions, mounting type, temperature range) are identical. The parts are functionally interchangeable.

Q: What is the significance of the "Not For New Designs" status on the ECS-40-S-1?

A: This designation indicates the manufacturer has transitioned this part to end-of-life status and recommends using the ECS-40-S-1X for new applications. Existing inventory of the ECS-40-S-1 may still be available for legacy support.

Q: Does the RoHS compliance difference affect circuit performance?

A: No. RoHS compliance relates to material composition and environmental regulations, not electrical or mechanical performance. Both parts operate identically within the specified parameters.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both parts use the HC-49/U package with identical dimensions: 0.447" L x 0.183" W (11.35mm x 4.65mm) and maximum seated height of 0.530" (13.46mm). They occupy the same PCB footprint.

Q: What is the load capacitance specification for these crystals?

A: Both parts are configured for Series load capacitance operation, a standard configuration for HC-49/U crystals in fundamental mode applications.